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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(1)\"><em></em>下载文档(未登录)九年级上册化学第五单元知识点描述：化学在发展过程中，依照所研究的分子类别和研究手段、目的、任务的不同，派生出不同层次的许多分支。化学传统地分为无机化学、有机化学、物理化学和分析化学四个分支。下面是小编整理的九年级上册化学第五单元知识点，仅供参考希望能够帮助到大家。九年级上册</a>';
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